Answer:
The answer is
<h2>40.0 mL</h2>Explanation:
The volume of a substance when given the density and mass can be found by using the formula
From the question
mass = 420 g
density = 10.5 g/cm³
The volume is
We have the final answer as
<h3>40.0 mL</h3>Hope this helps you
Hi there!
We can use the following conversions to solve:
Total mass --> amount of mols --> amount of atoms (Avogadro's number)
Begin by calculating the amount of boron trifluoride in 3.61 grams:
3.61 g * (1 mol BF₃ / 67.8 g) ≈ 0.0532 mol BF₃
Use avogadro's number to convert:
0.0532 mol * 6.02× 10²³atoms / 1 mol = 3.203 × 10²² atoms
Answer :
(A) ΔH is positive and ΔS is negative → (2) Spontaneous in reverse at all temperatures
(B) ΔH is positive and ΔS is positive → (3) Spontaneous as written above a certain temperature
(C) ΔH is negative and ΔS is positive → (1) Spontaneous as written at all temperatures
(D) ΔH negative and ΔS is negative → (4) Spontaneous as written below a certain temperature
Explanation :
According to Gibb's equation:
= Gibbs free energy
= enthalpy change
= entropy change
T = temperature in Kelvin
As we know that:
= +ve, reaction is non spontaneous
= -ve, reaction is spontaneous
= 0, reaction is in equilibrium
(A) ΔH is positive and ΔS is negative.
The reaction is non-spontaneous at all temperatures or spontaneous in reverse at all temperatures.
(B) ΔH is positive and ΔS is positive.
(at low temperature) (non-spontaneous)
(at high temperature) (spontaneous)
The reaction is spontaneous as written above a certain temperature.
(C) ΔH is negative and ΔS is positive.
The reaction is spontaneous as written at all temperatures
(D) ΔH is negative and ΔS is negative.
(at high temperature) (non-spontaneous)
(at low temperature) (spontaneous)
The reaction is spontaneous as written below a certain temperature.